Defoamer useful in a peracid composition with anionic surfactants

1. A low-foaming equilibrium peracid composition comprising:

a C 1 -C 22 peroxycarboxylic acid;

a C 1 -C 22 carboxylic acid;

hydrogen peroxide;

a mineral acid;

an anionic surfactant; and

from about 0.6 wt-% to about 0.75 wt-% of a metal salt defoaming agent, wherein the defoaming agent is aluminum sulfate;

wherein the composition has a use solution pH below about 4;

wherein the composition is provided as a concentrate, and wherein the composition is subsequently diluted at a ratio of between about 1:100 and about 1:5,000.

2. The composition of claim 1 , wherein the C 1 -C 22 peroxycarboxylic acid comprises from about 1 wt-% to about 40 wt-%, the C 1 -C 22 carboxylic acid comprises from about 1 wt-% to about 80 wt-%, the hydrogen peroxide comprises from about 1 wt-% to about 80 wt-%, the mineral acid comprises from about 5 wt-% to about 50 wt-%, and the anionic surfactant comprises from about 0.01 wt-% to about 40 wt-%.

3. The composition of claim 1 , further comprising at least one additional agent, wherein the at least one additional agent is a hydrotrope, a solvent, a stabilizing agent, a fluorescent active agent and combinations thereof.

4. The composition of claim 1 , wherein the C 1 -C 22 peroxycarboxylic acid is a C 2 -C 20 peroxycarboxylic acid comprising from about 1 wt-% to about 20 wt-% and wherein the C 1 -C 22 carboxylic acid is a C 2 -C 20 carboxylic acid comprising from about 1 wt-% to about 50 wt-%.

5. The composition of claim 4 , wherein the peroxycarboxylic acid is peroxyacetic acid, peroxyoctanoic acid and/or peroxysulfonated oleic acid, and wherein the carboxylic acid is acetic acid, octanoic acid, sulfonated oleic acid or a combination of the same.

6. The composition of claim 1 , wherein the defoaming agent is present in a use solution in an amount from about 0.1 ppm to about 50 ppm.

7. The composition of claim 1 , wherein the pH of the use solution is below about 3.

8. The composition of claim 1 , wherein the anionic surfactant is sodium octane sulfonate and sulfonated oleic acid.

9. The composition of claim 1 , further comprising a peroxycarboxylic acid stabilizing agent, wherein the stabilizing agent is a picolinic acid or a compound having the following Formula (IA):

wherein R 1 is OH or —NR 1a R 1b , wherein R 1a and R 1b are independently hydrogen or (C 1 -C 6 )alkyl; wherein R 2 is OH or NR 2a R 2b , wherein R 2a and R 2b are independently hydrogen or (C 1 -C 6 )alkyl; wherein each R 3 is independently (C 1 -C 6 )alkyl, (C 2 -C 6 )alkenyl or (C 2 -C 6 )alkynyl; and n is a number from zero to 3; or a salt thereof;

or a compound having the following Formula (TB):

wherein R 1 is OH or NR 1a R 1b , wherein R 1a and R 1b are independently hydrogen or (C 1 -C 6 )alkyl; wherein R 2 is OH or —NR 2a R 2b , wherein R 2a and R 2b are independently hydrogen or (C 1 -C 6 )alkyl; wherein each R 3 is independently (C 1 -C 6 )alkyl, (C 2 -C 6 )alkenyl or (C 2 -C 6 )alkynyl; and n is a number from zero to 3; or a salt thereof, wherein the stabilizing agent delays or prevents the peroxycarboxylic acid from exceeding its self-accelerating decomposition temperature (SADT).

10. A low-foaming, stabilized equilibrium peracid composition comprising:

from about 1 wt-% to about 40 wt-% of a C 1 -C 22 peroxycarboxylic acid;

from about 1 wt-% to about 80 wt-% of a C 1 -C 22 carboxylic acid;

from about 1 wt-% to about 80 wt-% of hydrogen peroxide;

from about 1 wt-% to about 50 wt-% of a mineral acid;

from about 0.01 wt-% to about 40 wt-% of a low-foaming anionic surfactant;

from about 0.6 wt-% to about 0.75 wt-% of a metal salt defoaming agent, wherein the defoaming agent is aluminum sulfate; and

from about 0.01 wt-% to about 10 wt-% of a peroxycarboxylic acid stabilizing agent,

wherein the stabilizing agent is a picolinic acid or a compound having the following Formula (IA):

wherein R 1 is OH or NR 1a R 1b , wherein R 1a and R 1b are independently hydrogen or (C 1 -C 6 )alkyl; wherein R 2 is OH or —NR 2a R 2b , wherein R 2a and R 2b are independently hydrogen or (C 1 -C 6 )alkyl; wherein each R 3 is independently (C 1 -C 6 )alkyl, (C 2 -C 6 )alkenyl or (C 2 -C 6 )alkynyl; and n is a number from zero to 3; or a salt thereof; or a compound having the following Formula (IB):

wherein R 1 is OH or NR 1a R 1b , wherein R 1a and R 1b are independently hydrogen or (C 1 -C 6 )alkyl; wherein R 2 is OH or —NR 2a R 2b , wherein R 2a and R 2b are independently hydrogen or (C 1 -C 6 )alkyl; wherein each R 3 is independently (C 1 -C 6 )alkyl, (C 2 -C 6 )alkenyl or (C 2 -C 6 )alkynyl; and n is a number from zero to 3; or a salt thereof;

wherein the composition has a use solution pH below about 4;

wherein the composition is provided as a concentrate and the composition is subsequently diluted

at a ratio of between about 1:100 and about 1:5,000,

wherein the defoaming agent and anionic surfactant provide enhanced biocidal efficacy for the composition.

11. The composition of claim 10 , wherein the C 1 -C 22 peroxycarboxylic acid comprises from about 1 wt-% to about 20 wt-%, the C 1 -C 22 carboxylic acid comprises from about 1 wt-% to about 50 wt-%, the hydrogen peroxide comprises from about 1 wt-% to about 50 wt-%, the mineral acid comprises from about 1 wt-% to about 20 wt-%, the surfactant comprises from about 0.1 wt-% to about 25 wt-%, and the stabilizing agent comprises from about 0.01 wt-% to about 1 wt-%.

12. The composition of claim 11 , wherein the C 1 -C 22 peroxycarboxylic acid is a combination of peroxyoctanoic acid and peroxysulfonated oleic acid, the C 1 -C 22 carboxylic acid is acetic acid, the mineral acid is sulfuric acid, and the stabilizing agent is dipicolinic acid.

13. The composition of claim 10 , further comprising a hydrotrope, a solvent or combinations thereof, wherein the hydrotrope is sodium xylene sulfonate or sodium cumene sulfonate.

14. The composition of claim 10 , wherein the C 1 -C 22 peroxycarboxylic acid is a C 2 -C 20 peroxycarboxylic acid and wherein the C 1 -C 22 carboxylic acid is a C 2 -C 20 carboxylic acid.

15. The composition of claim 14 , wherein the peroxycarboxylic acid is peroxyacetic acid, peroxyoctanoic acid and/or peroxysulfonated oleic acid, and wherein the carboxylic acid is acetic acid, octanoic acid, sulfonated oleic acid or a combination of the same.

16. The composition of claim 10 , wherein the aluminum sulfate is present in a use solution in an amount of from about 0.1 ppm to about 50 ppm.

17. A method for reducing a microbial population using a low-foaming equilibrium peroxycarboxylic acid composition comprising:

providing the peroxycarboxylic acid composition of claim 1 ; and

contacting a surface or substrate with a use solution of the composition for at least 10 seconds, wherein the use solution has a pH below about 4.

18. The method of claim 17 , wherein the C 1 -C 22 peroxycarboxylic acid is peroxyacetic acid, peroxyoctanoic acid, peroxysulfonated oleic acid and combinations thereof, wherein the C 1 -C 22 carboxylic acid is acetic acid, octanoic acid, sulfonated oleic acid and combinations thereof.

19. The method of claim 17 , wherein the surface or substrate is a food item, plant item, animal item, a container, an equipment, a system or a facility for growing, holding, processing, packaging, storing, transporting, preparing, cooking or serving the food item, plant item or the animal item, an instrument, a hard surface, a liquid media, equipment, a fabric surface, a fouled water or industrial processing liquid source, liquid system, or process water used in oil, gas and/or industrial processing operations.